﻿function datenum(v, date1904) {
    if (date1904) v += 1462;
    var epoch = Date.parse(v);
    return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
    var r_s = opts.row_begin || 0,
        c_s = opts.col_begin || 0,
        defCellStyle = Object.assign({
            s: { alignment: { horizontal: "center", vertical: "right" } },
            n: { alignment: { horizontal: "center", vertical: "left" } },
            d: { alignment: { horizontal: "center", vertical: "center" } }
        }, opts.defualtCellStyle),
        ws = {},
        range = { s: { c: 10000000, r: 10000000 }, e: { c: 0, r: 0 } };
    for (var R = 0; R != data.length; ++R) {
        for (var C = 0; C != data[R].length; ++C) {
            if (range.s.r > R) range.s.r = R;
            if (range.s.c > C) range.s.c = C;
            if (range.e.r < R) range.e.r = R;
            if (range.e.c < C) range.e.c = C;
            var cell = { v: data[R][C] };
            if (cell.v == null) continue;
            var cell_ref = XLSX.utils.encode_cell({ c: C + c_s, r: R + r_s });

            if (typeof cell.v === 'number') {
                cell.t = 'n';
                cell.s = defCellStyle.n;
            }
            else if (typeof cell.v === 'boolean') {
                cell.t = 'b';
            }
            else if (cell.v instanceof Date) {
                cell.t = 'n'; cell.z = XLSX.SSF._table[14];
                cell.v = datenum(cell.v);
                cell.s = defCellStyle.d;
            }
            else {
                cell.t = 's';
                cell.s = defCellStyle.s;
            }


            ws[cell_ref] = cell;
        }
    }
    range.e.r += r_s;
    range.e.c += c_s;
    if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
    return ws;
}

function Workbook() {
    if (!(this instanceof Workbook)) return new Workbook();
    this.SheetNames = [];
    this.Sheets = {};
}

function s2ab(s) {
    var buf = new ArrayBuffer(s.length);
    var view = new Uint8Array(buf);
    for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
    return buf;
}